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WA appeal bids by Pruiti murderers fail

Two Perth men who murdered, dismembered, set alight and buried a fellow methamphetamine user in a bush grave have failed in their bid to overturn their convictions and sentences.

Daniel Marchesano and Ben Mansfield were convicted in 2015 in the West Australian Supreme Court of murdering Michael Pruiti two years earlier, and were respectively sentenced to at least 23 and 26 years behind bars.

Marchesano lured Mr Pruiti, 31, to isolated bushland in Perth's Hills region where Mansfield shot him in the head.

Marchesano, who was aged 18 at the time, claimed he took part in the killing because Mansfield had threatened him and his family.

His lawyer argued he was terrified of Mansfield, who was 15 years older, had fired a gun at his family home shortly before Mr Pruiti arrived and was "watching him like a hawk".

The lawyer said Marchesano didn't have time to think about contacting police, but counsel for the state told the WA Court of Appeal he had opportunities to do so and get away from Mansfield.

"No reasonable jury properly instructed could conclude that participating in the intentional killing of the deceased was a reasonable response to the threat in those circumstances," Justice Michael Buss said on Friday.

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Mansfield's lawyer argued the jury heard prejudicial information about his client, namely that he had prior convictions for violence and firearms offences, which Marchesano submitted in a bid to prove duress.

But Justice Buss said the evidence was properly admitted as part of Marchesano's defence case.

"In the circumstances, the appellant cannot demonstrate that he suffered a miscarriage of justice unless he establishes that the decision not to grant him a separate trial was wrong," the judge said.